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Title: Phase assemblage of composite cements

Abstract

The phase assemblage of binary Portland cements with 45 wt% replacement by calcareous fly ash and slag has been investigated by experiment, mass balance and thermodynamic simulations. The input for these calculations was based on clinker reaction measured by XRD-Rietveld refinement, on SCM reaction measured by SEM-EDS full element mapping and on C-S-H composition by SEM-EDS point analyses. A sensitivity analysis estimates the uncertainty of determination of phase volume as at best ± 2 cm{sup 3}/100 cm{sup 3}, and thus of rather semi-quantitative character. The differences between experiment and calculations regarding AFt/AFm, C-S-H and portlandite were assessed. Gel/space ratios computed using the volumes of all hydrates showed a clear correlation to compressive strength, which was unaffected by the mix composition. This suggests that the type of hydrates formed has little or no influence on the compressive strength and that the key factor is the space filling.

Authors:
 [1];  [2]; ;  [3];  [1]
  1. Laboratory of Construction Materials, École Polytechnique Fédérale de Lausanne (EPFL), Station 12, CH-1015 Lausanne (Switzerland)
  2. (HeidelbergCement AG), Rohrbacher Str. 95, 69181 Leimen (Germany)
  3. HeidelbergCement Technology Center GmbH (HeidelbergCement AG), Rohrbacher Str. 95, 69181 Leimen (Germany)
Publication Date:
OSTI Identifier:
22701569
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 99; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ATOMIC FORCE MICROSCOPY; COMPRESSION STRENGTH; FLY ASH; HYDRATES; HYDRATION; PORTLAND CEMENT

Citation Formats

Durdziński, Paweł T., E-mail: pawel.durdzinski@gmail.com, HeidelbergCement Technology Center GmbH, Ben Haha, Mohsen, Zajac, Maciej, and Scrivener, Karen L. Phase assemblage of composite cements. United States: N. p., 2017. Web. doi:10.1016/J.CEMCONRES.2017.05.009.
Durdziński, Paweł T., E-mail: pawel.durdzinski@gmail.com, HeidelbergCement Technology Center GmbH, Ben Haha, Mohsen, Zajac, Maciej, & Scrivener, Karen L. Phase assemblage of composite cements. United States. doi:10.1016/J.CEMCONRES.2017.05.009.
Durdziński, Paweł T., E-mail: pawel.durdzinski@gmail.com, HeidelbergCement Technology Center GmbH, Ben Haha, Mohsen, Zajac, Maciej, and Scrivener, Karen L. Fri . "Phase assemblage of composite cements". United States. doi:10.1016/J.CEMCONRES.2017.05.009.
@article{osti_22701569,
title = {Phase assemblage of composite cements},
author = {Durdziński, Paweł T., E-mail: pawel.durdzinski@gmail.com and HeidelbergCement Technology Center GmbH and Ben Haha, Mohsen and Zajac, Maciej and Scrivener, Karen L.},
abstractNote = {The phase assemblage of binary Portland cements with 45 wt% replacement by calcareous fly ash and slag has been investigated by experiment, mass balance and thermodynamic simulations. The input for these calculations was based on clinker reaction measured by XRD-Rietveld refinement, on SCM reaction measured by SEM-EDS full element mapping and on C-S-H composition by SEM-EDS point analyses. A sensitivity analysis estimates the uncertainty of determination of phase volume as at best ± 2 cm{sup 3}/100 cm{sup 3}, and thus of rather semi-quantitative character. The differences between experiment and calculations regarding AFt/AFm, C-S-H and portlandite were assessed. Gel/space ratios computed using the volumes of all hydrates showed a clear correlation to compressive strength, which was unaffected by the mix composition. This suggests that the type of hydrates formed has little or no influence on the compressive strength and that the key factor is the space filling.},
doi = {10.1016/J.CEMCONRES.2017.05.009},
journal = {Cement and Concrete Research},
issn = {0008-8846},
number = ,
volume = 99,
place = {United States},
year = {2017},
month = {9}
}